Thermal nodal networks are used to predict the behavior of large complex interacting systems. By breaking down components into thermal resistances and capacitances, representing them as an electrical circuit, and using linear algebra, we can solve simultaneous equations to determine how temperatures evolve in time. This method can solve for time-varying, temperature varying, and non-linear thermal behavior between arbitrary numbers of nodes. Common applications include modeling vehicles, structures, or products with heat sources and sinks that must be kept within specifications.